Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 464, Issue -, Pages 216-220Publisher
ELSEVIER
DOI: 10.1016/j.jnucmat.2015.04.045
Keywords
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Funding
- National Magnetic Confinement Fusion Program [2011GB108011]
- National Science Foundation of China [NSF-11175038, NSF-10875025]
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Low-energy (20-520 eV) hydrogen ion irradiations were performed at W surface temperature of 373-1073 K and a fluence ranging from 5.0 x 10(23) to 1.0 x 10(25)/m(2). Conductive atomic force microscopy (CAFM) as a nondestructive analytical technique was successfully used to detect irradiation-induced defects in polycrystalline W. The size and density of these nanometer-sized defects were strongly dependent on the fluence of hydrogen ions. Both ion energy (E) and temperature (T) play a crucial role in determining the ordering of nanometer-sized defects. Ordered arrangements were formed at relatively high E and T. This can be attributed to the stress-driven ripple effect of defect growth at crystal grains, resulting in the movement of W lattice along one certain crystal planes. (C) 2015 Elsevier BY. All rights reserved.
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